Need to find alternatives to this non-existent capacitor!

[Tony Stewart]

I meant same and surely not the post bridge filter. It is noise generated while the diode trasnsits around 0.65V either in raising or trailing mode. ( forgot the name for this-- ringing noise or some such thing . t is surely double the mains frequency.
A momentary tart of conduction , i suppose makes up a small spike like.
During 60s attending transistorised radio receivers, working from in built power supplies,
the 100Hz hum was disturbing even on shotwave bands and once these parallel caps are placed across diodes, it just disappears.

Yes the diode bridge resonates when not conducting with high impedance diode capacitance and secondary inductance but low current.
I understand now that the current spike reaches the AM band so it is the harmonics of 100Hz impulse that sounds like hum in the AM band. But this doesn't help baseband ripple for a speaker amp.

 

[mvs sarma]

It works, IMHO, even for audio amplifiers,

 

[Jason Lai]

I know the capacitors in question here are electrolytics, but if you ever wanted to find alternative part numbers for ceramic capacitors, you can use this website **broken link removed**